I guess the difference between AT & AP here is that for whatever historical reasons, nobody uses the AP client-server API as I understand, so the APIs like the Mastodon REST one serve as a de facto official client API, for better or worseโฆ so I think it makes perfect sense to list libraries for them
If you have a fediverse account, you can quote this note from your own instance. Search https://bsky.brid.gy/convert/ap/at://did:plc:oio4hkxaop4ao4wz2pp3f4cr/app.bsky.feed.post/3lzrpjvrpak2v on your instance and quote it. (Note that quoting is not supported in Mastodon.)